Service Manual

10
2. Freezer
Freezer Sequence Flow Chart
3. Cool Down Restart
Legend: Comp-compressor ConFM-condenser fan motor CTh-cabinet thermistor DH-defrost heater DrH-drain heater DTh-defrost thermistor EvapFM-evaporator fan motor MH-mullion heater PH-perimeter heater
1. Startup/Cool Down
2. Cool Down Achieved
Comp energized ConFM energized EvapFM energized MH energized PH energized
CTh in control
Slight Delay at Startup
CTh cools to 3°F (1.7°C) below setpoint. Factory default -4°F (-20°C)
CTh warms to 3°F (1.7°C) above setpoint
4. Defrost
EvapFM energized MH energized PH energized Comp de-energized ConFM de-energized
5. Defrost Termination
MH energized PH energized DH de-energized DrH de-energized Comp energized (after delay) ConFM energized (after delay) EvapFM energized (after delay)
DTh warms to 59°F (15°C)
Note:
a) EvapFM de-energizes when door is opened on -FS models and when upper door is opened on -HS models. b) 2-min. minimum Comp on timer starts when Comp energizes. c) 2-min. minimum Comp off timer starts when Comp de-energizes. d) 5-min. minimum defrost time. e) 1-hr. maximum defrost time. f) 3-min. Comp/ConFM delay timer starts when defrost termination temperature is met. g) 7-minute EvapFM delay timer starts when defrost termination temperature is met (3-minute delay timer when defrost initiated manually) h) 18-minute temperature display delay timer starts when defrost termination temperature is met (15-minute delay timer when defrost initiated manually).
DTh in control
Power on
DH energized DrH energized MH energized PH energized Comp de-energized ConFM de-energized EvapFM de-energized
2-min. Comp off timer starts
MH energized PH energized
2-min. Comp on timer starts
DTh reaches 32°F (0°C), then 4-hr. cumulative Comp run timer starts
DTh is at or below 32°F (0°C) and 4-hr. cumulative Comp run timer terminates